Is the weather-15 degrees cold or-10 degrees cold?

Fifteen degrees below zero is colder than eleven degrees below zero. Write it at minus five degrees-15℃ and minus eleven degrees-1 1℃. If it is colder than both temperatures, it is smaller than which number, that is, comparing the sizes of-15 and-1 1. Comparing the sizes of two negative numbers, the absolute value is larger but smaller. The absolute value of-15 is 15, and the absolute value of-1 1. If the absolute value of-15 is large, then-15.

Formation of sub-zero temperature Usually, the environment we live in and the system we study are all systems with infinite quantum states. In such a system, the internal energy always increases with the increase of chaos, so there is no negative thermodynamic temperature. However, a few systems with finite quantum states, such as crystals produced by laser, will reach infinite temperature when the internal energy of the system increases continuously until the disorder degree of the system does not change with the internal energy. At this time, when the internal energy of the system further increases, that is, when the so-called "population inversion" is reached, the internal energy increases with the decrease of disorder degree, so the thermodynamic temperature at this time is negative. But there is no classical algebraic relationship between negative temperature and positive temperature, and negative temperature is higher than positive temperature. The concept of temperature scale extended by quantum statistical mechanics is: infinite quantum state system: positive absolute zero.